Add a test closing an empty file system

Author: dkovba

Tests/ContainerizationEXT4Tests/TestEXT4Format.swift

@@ -156,9 +156,9 @@ struct Ext4FormatTests: ~Copyable {
     @Test func groupDescriptors() throws {
         let f = try EXT4.EXT4Reader(blockDevice: fsPath)
         let gd = try f.getGroupDescriptor(0)
-        #expect(gd.blockBitmapLow == 551)  // move over by 512 blocks (for inodes)
-        #expect(gd.inodeBitmapLow == 552)  // move over by 512 blocks (for inodes)
-        #expect(gd.inodeTableLow == 39)
+        #expect(gd.blockBitmapLow == 520)
+        #expect(gd.inodeBitmapLow == 521)
+        #expect(gd.inodeTableLow == 8)
         #expect(gd.freeBlocksCountLow == 32246)  // 512 block used by larger inode table per block group
         #expect(gd.freeInodesCountLow == 8176)  // 512 times the inodes
         #expect(gd.usedDirsCountLow == 5)
@@ -219,3 +219,14 @@ struct Ext4FormatTests: ~Copyable {
         #expect(regFile.sizeLow == 4)
     }
 }
+
+struct Ext4FormatEmptyRangeTests {
+    @Test func closeEmptyFilesystem() throws {
+        let fsPath = FilePath(
+            FileManager.default.temporaryDirectory
+                .appendingPathComponent(UUID().uuidString, isDirectory: false))
+        defer { try? FileManager.default.removeItem(at: fsPath.url) }
+        let formatter = try EXT4.Formatter(fsPath, minDiskSize: 32.kib())
+        try formatter.close()
+    }
+}